676561 has 4 divisors (see below), whose sum is σ = 682992. Its totient is φ = 670132.

The previous prime is 676523. The next prime is 676573. The reversal of 676561 is 165676.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-676561 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (676061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3055 + ... + 3268.

It is an arithmetic number, because the mean of its divisors is an integer number (170748).

2⁶⁷⁶⁵⁶¹ is an apocalyptic number.

It is an amenable number.

676561 is a deficient number, since it is larger than the sum of its proper divisors (6431).

676561 is a wasteful number, since it uses less digits than its factorization.

676561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6430.

The product of its digits is 7560, while the sum is 31.

The square root of 676561 is about 822.5332820014. The cubic root of 676561 is about 87.7881007046.

It can be divided in two parts, 6 and 76561, that added together give a palindrome (76567).

The spelling of 676561 in words is "six hundred seventy-six thousand, five hundred sixty-one".